diff --git a/all.txt b/all.txt
new file mode 100644
index 0000000..c576bfa
--- /dev/null
+++ b/all.txt
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+package Internship;
+
+public class jjcc {
+	 static void sum(double a, double b) {
+		double resum=a+b;
+		System.out.println(a+"+"+b+"="+resum);
+	}
+	static void subtraction(double a,double b) {
+		double resub=a-b;
+		System.out.println(a+"-"+b+"="+resub);
+	}
+	static void mul(double a,double b) {
+		double remul=a*b;
+		System.out.println(a+"*"+b+"="+remul);
+	}
+	static void division(double a,double b) {
+		double redivision=0;
+		if(b!=0) {
+			redivision=a/b;
+		}
+		else {
+			redivision=0;   /*表示错误*/
+		}
+		System.out.println(a+"÷"+b+"="+redivision);
+	}
+
+}
+
+
+package Internship;
+
+public class ex {
+	static void e(int x) {
+		double e=Math.E;
+        double result;
+        
+        result=Math.pow(e,x);
+        System.out.println("result="+result);
+       	
+    }
+}
+
+
+package Internship;
+
+
+public class logax {
+	static void log(int a, int x) {
+		System.out.println("log"+a+" "+x+" = "+(Math.log(x)/Math.log(a)));
+	}
+	
+}
+
+
+package Internship;
+
+public class Trigonometric_Functions {
+	public Trigonometric_Functions(String chose,double Value) {
+		double a = Math.toRadians(Value);
+		switch(chose) {
+		    case "sin":
+		    	System.out.println(String.format("%.2f",Math.sin(a)));
+		    	break;
+		    case "cos":
+		    	System.out.println(String.format("%.2f",Math.cos(a)));
+		    	break;
+		    case "tan":
+		    	System.out.println(String.format("%.2f",Math.tan(a)));
+		    	break;
+		}
+	}
+}
+
+
+package Internship;
+
+import java.util.Scanner;
+
+public class Test {
+	public static void main(String[] args) {
+		int a, b;
+		Scanner sc = new Scanner(System.in);
+		
+		System.out.println("输入a的值:");
+		a = sc.nextInt();
+		System.out.println("输入b的值:");
+		b = sc.nextInt();
+		
+		System.out.println("加减乘除运算:");
+		jjcc.sum(a, b);
+		jjcc.subtraction(a, b);
+		jjcc.mul(a, b);
+		jjcc.division(a, b);
+		System.out.println();
+		
+		System.out.println("e的x次方运算:");
+		ex.e(a);
+		System.out.println();
+		
+		System.out.println("logax运算:");
+		logax.log(a, b);
+		System.out.println();
+		
+		System.out.println("三角函数运算:");
+		Trigonometric_Functions tf1 = new Trigonometric_Functions("sin", 30);
+		Trigonometric_Functions tf2 = new Trigonometric_Functions("cos", 30);
+		Trigonometric_Functions tf3 = new Trigonometric_Functions("tan", 30);
+	}
+}